Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f6587cfba2a3a7…

MALICIOUS

PDF

93.1 KB Created: 2021-08-04 22:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05449a27af8b347a952596fefa60ab9b SHA-1: 5056a017f1e3b1ecc246bbfd417f03758a09978e SHA-256: b1f6587cfba2a3a7d8a4a87f164dc5ce488b4768b9fa8f08aaaf0f1ff9876831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious destinations, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://renetravel.ro/images/files/89278969532.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a5ba381f---45109662051.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/3128820703.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70fec06e7c---tafuseto.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/fatesarop.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd039437f---67696076304.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/47934593572.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d4df2fc7add---68024262406.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/undf3k44pmblerf3dq79losp6d/35927504462.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7074ab6a8---60314526831.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac5b506ef---67102739298.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/07aa199ec76c04e8f1155340a71f4a8c/nemavaregatimifokaza.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c117c141fb1---vekisuvubudisalerakaxije.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f7c779c---1102106913.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804eea07c7---79676438532.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f183e0e55e---nobubamepik.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/52858081783.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/82031bdc790f59aa503ec45c1123e3d3/gelozaleda.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/83474101041.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/loziposiwipadabe.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/700608786.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c566854518042bacff15e0a96d0e2028/buzeditatupog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+greenhouse+effect+and+its+effectsPDF link annotation
    • http://irodori.kir.jp/files/file/52097028366.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 10800 bytes
SHA-256: 475406d8d096a3343772903fd993af9d36d49ea8150840b84601c80f8b896ecb
font_01_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 17020 bytes
SHA-256: 64c42903c65abfb500e40a17008f8843babfa366baeaf2425fdcc6399e9c70d1

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